Joker
Truncation & Wildcards

When a truncation symbol is added to the stem of a word, it will find that stem plus anything that comes after it. 

environ* will return records on environment, environments, environmental.
wildcard symbol is used to replace a letter in a word, so that various spellings of the word will be returned.
wom?n will return records on women or woman. 
The symbol used for truncation or as a wildcard depends upon the index, database, or search engine you are using. Use the HELP in any index, database or search engine to find out what truncation or wildcard symbol is used.
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